preformed

a preformed pool.

个预制的水池。

preformed joint filler

预塑式嵌缝板, 预制填缝料

The structure of the preformed armor rods is simple and a set of preformed rods become an empty pipe and enlace ,hold and protect the conductor。

预绞式护线条结构，组预绞丝形成空管，包裹导线时产生握紧力，从而保护导线；

Dacryocystography was preformed in all patients before operation to confirm the obstructive sity and the size of lacrimal sac.

术前造以了解泪囊的大小和阻塞的部位，以选择最佳手术适应证。

When installation, unlade the join copper bus bar, through the preformed long-square hole, fixing it on the main grounding bus bar.

安装时铜排卸下，穿越柜间预留的长方孔，固定在相邻两柜的主接地铜排上。